Re: Recomendations on raid controllers raid 1+0
От | Glyn Astill |
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Тема | Re: Recomendations on raid controllers raid 1+0 |
Дата | |
Msg-id | 992988.82686.qm@web25812.mail.ukl.yahoo.com обсуждение исходный текст |
Ответ на | Recomendations on raid controllers raid 1+0 (Glyn Astill <glynastill@yahoo.co.uk>) |
Ответы |
Re: Recomendations on raid controllers raid 1+0
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Список | pgsql-performance |
Bonie++ benchmarks below. I believe the the Perc 5/i Raid 10 mode is actually a span of mirrors, rather than the expected stripe of mirrors we shouldexpect from 1+0, and that this is the reason for the shitty performance. RAID 5 ====== Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP way5a 32096M 55354 97 201375 59 109586 23 59934 97 427541 33 767.9 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ way5a,32096M,55354,97,201375,59,109586,23,59934,97,427541,33,767.9,1,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ RAID 10 ======= Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP Way5a 32096M 53479 99 131640 33 66718 10 58225 95 339287 25 699.1 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ Way5a,32096M,53479,99,131640,33,66718,10,58225,95,339287,25,699.1,1,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ ----- Original Message ---- > From: Guillaume Smet <guillaume.smet@gmail.com> > To: Glyn Astill <glynastill@yahoo.co.uk> > Cc: pgsql-performance@postgresql.org > Sent: Thursday, 13 March, 2008 3:58:41 PM > Subject: Re: [PERFORM] Recomendations on raid controllers raid 1+0 > > Glyn, > > On Thu, Mar 13, 2008 at 1:33 PM, Glyn Astill wrote: > > I'm looking at switching out the perc5i (lsi megaraid) cards from our > > Dell 2950s for something else as they're crap at raid 10. > > Do you have numbers? Perc 5/i cards perform quite well for us (we have > a 8 disks RAID 10 in a 2900 server with the traditional Perc 5/i). > > -- > Guillaume ___________________________________________________________ Rise to the challenge for Sport Relief with Yahoo! For Good http://uk.promotions.yahoo.com/forgood/
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